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47 lines
848 B
C++
Executable File
47 lines
848 B
C++
Executable File
// LSBFEncoder.cpp
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#include "StdAfx.h"
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#include "LSBFEncoder.h"
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#include "Common/Defs.h"
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namespace NStream {
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namespace NLSBF {
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void CEncoder::WriteBits(UINT32 aValue, UINT32 aNumBits)
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{
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while(aNumBits > 0)
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{
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UINT32 aNumNewBits = MyMin(aNumBits, m_BitPos);
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aNumBits -= aNumNewBits;
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UINT32 aMask = (1 << aNumNewBits) - 1;
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m_CurByte |= (aValue & aMask) << (8 - m_BitPos);
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aValue >>= aNumNewBits;
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m_BitPos -= aNumNewBits;
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if (m_BitPos == 0)
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{
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m_Stream.WriteByte(m_CurByte);
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m_BitPos = 8;
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m_CurByte = 0;
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}
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}
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}
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void CReverseEncoder::WriteBits(UINT32 aValue, UINT32 aNumBits)
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{
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UINT32 aReverseValue = 0;
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for(UINT32 i = 0; i < aNumBits; i++)
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{
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aReverseValue <<= 1;
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aReverseValue |= aValue & 1;
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aValue >>= 1;
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}
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m_Encoder->WriteBits(aReverseValue, aNumBits);
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}
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}}
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